Answer:
Both search results [1] and [6] suggest that first-degree atrioventricular (AV) block is a delay and not a true block. Specifically, search result [1] explains that a minor AV conduction defect occurs at or below the AV node, while search result [6] states that there is only a delay around the AV node and each impulse is eventually conducted. Therefore, the answer to the question "Which of the following is a delay and not a true AV heart block?" is first-degree AV block.
Step-by-step explanation: